Magazine type slide projector



April 22, 1952 R. A. HARTLEY MAGAZINE TYPE SLIDE PROJECTOR 6Sheets-Sheet 1 Filed May 17, 1947 INVENTOR.

April 22, 1952 R. A. HARTLEY MAGAZINE TYPE SLIDE PROJECTOR 6Sheets-Sheet 2 Filed May 17, 1947 INVENTOR.

I at v11 FITTOBNEY April 22, 1952 R. A. HARTLEY 2,594,162

MAGAZINE TYPE SLIDE PROJECTOR Filed May 17, 1947 6 Sheets-Sheet aINVENTOR.

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HTTOQNEV April 22, 1952 HARTLEY 2,594,162

MAGAZINE TYPE SLIDE PROJECTOR Filed May 1'7, 1947 6 Sheets-Sheet 4 5 85INVEN TOR.

QTTOBNEV April 22, 1952 R. A. HARTLEY 2,594,162

MAGAZINE TYPE SLIDE PROJECTOR Filed May 17, 1947 e Sheets-Sheet 5 28 7173 I 158 jliykla 18 as" a5 .Alllll'llllll IN VEN TOR.

April 22, 1952 R. A. HARTLEY 2,594,162

MAGAZINE TYPE SLIDE PROJECTOR Filed May 17, 1947 6 Sheets-Sheet 6 y1.-?/ 2 L132 INVENTOR.

,SiiiOll to the other.

Patented Apr. 22, 1952 UNITED STATES PATENT OFFICE MAGAZINE TYPE SLIDEPROJECTOR "Richard A. Hartley, North Hollywood,fCalif.

...; Ap.plication.May 17, 1947', Serial No. 748,711

(01. ss-zs) 7 Claims.

.1, 1, This invention relates to a, slide projector of the type equippedto transfer slides from one slide-holdin magazine to anothermagazine by4 way of a slide-projecting position.

Slide projectors of the present type are. in

great demand for use during lectures, in institutions of learning, forhome use and for other illustrative projects. Slide projectors haveheretofore been proposed which provide a mechanism for shifting slidesfrom a magazine into the projection position in line with the opticalsystem of a projector and fromthe projecting position into a secondmagazine. All of these slide projectors known to me are deficient inmany ways. For example, they are not equipped to shift a slide from theprojecting position into either magazine, or to shift a slide from onemagazine to the projectin position and return the slide to the samemagazine. Often in lectures and the like it is desirable, to refer backto a slide previously used, and the prior machines known to me areincapable of rendering this service. Also, slides are more or lessdelicately construct- .ed and must he gently handled in order. to extendthe life of the slide. .Slides are often damaged by using slidespositioned in the same plane for pushing one another from one positionto the other. of. the slide and soonrenders it inefiicient', if notThiscauses wear and .tear on the edges inoperable, in such slideprojectors. Moreover,

, such slide. projectorsas are heretofore known to me arequitecomplicated and expensive. and beyond the price rangeof a greatImanypeople desiring their use.

The present invention. providesend discloses a slide projector that willnot only feed slides from a magazine into the projecting position inline with the. optical. systemand from this latterposition into a secondmagazine, but the present device willcshift. the slide from .the. secondj-,magazine-,-baclr into the optical position,- and, if

required back' into the first magazine. ;In order to preteenthev slideswhen being shifted from one. position to the' other, thepresent-invention prov-ides inechanicalmeans'for moving each inividualslide and at no time is one slide dependent upon another slide to urgeit from one po- This function protects the edges of the slides andmakes.for a longer life.

"The present inventionprovides a slide transport 'hich shifts theslides: fromone position to'the $031161 in-such a gentle and accuratemanner as to preclude any damage to the slide.

A primary. object of the present invention is to provide in aslideprojector a'novelslide transhaving a novel slide supportiorshifting aliglide frrm the projectinghpositionof a projector. into amagazine and returning .theislide to. the said projecting position. r

Another 'objectis to provldein al' .slide projector a novelslidetransportwhich .may:.. be readily adaptedfor operation manuallytorqby power andwhich may be .remote controlledfrom any distance. I

Another object is to provide a slide. projector which may. be operatedatregular or-i-rreular I intervalsfor transferring a slide from-thepro-'jecting- .positionof a. projectorto slide-holding magazines located oneither side. of theflslide projecting position. 1

A further object is to provide a slidelprojeotor having the abovecharacteristics wherein themechanism is eiiicient,-reliable, and willhandle the slides gently so as not to damage them.

A still further object is to'provide a slide projector having the abovecharacteristicdwhich shall be sufiiciently simple in structure andinexpensive to manufacture as to enable'its use in projectors andviewers at a comparatively small cost.

The above and other objects will be madej ap parent throughout thefurther 'description 'of'the invention .when taken in connectionW'iththe accompanying drawings wherein like reference characteristicsrefer/to like parts. It' isto be distinctly understood. that. the.drawings 'are-Lnot a definition ofstheinvention but mgreiyj i ustrateone formby meansoflwhicli the invention may. beieiiectuated.

Inthe. drawings: g Fig. 1 is athree-quarters f o n View of a slideprojector embodying. the invention.

Fig. 2 is a side elevational viewiof Fig. 1 having the side coverremoved. n Fig. dis a sectional -view-. taken a qn the line III.-III ofFig. .2havingithecoven removed.

Fig. 4 is a sectional'viewtaken. along .the line -IV-IV of Fig. 3.

Fig. 5 is asectional view taken along theline V V of Fig. 4.

bottom 23, a top 24, and sides 25 and 26.

Fig. 6 is a sectional view taken along the line VI-VI of Fig. 4.

' Fig.7 is an enlarged view of Fig. showing certain of the parts of themechanism in a different position.

Fig. 8 is an enlarged view of Fig. 3 showing certain parts of themechanism in a different position.

Fig.9 is a sectional view taken along the line IX-IX of Fig. 8.

Fig. 10 is a view similar to Fig. 9 showing parts of the mechanism in adifferent position.

Fig. 11 is a view similar to Figs. 9 and 10 showing certain of the partsin still another position.

Fig. 12 is a view similar to Figs. 9, l0 and 11 showing certain of theparts in still another position.

Fig. 13 is a sectional view taken along the line XIIIXIII of Fig. 8.

Fig. 14 is a partial view of Fig. 13 showing certain parts of themechanism in-a difierent position.

Fig.715 is a sectional view taken along the line XV-XV of Fig. 3.

Fig. 16 is a partial View of Fig. illustrating another position of adetail embodying the invention.

Fig. 17 is a View similar to Fig. 16 showing the detail in still anotherposition.

Fig. 18 is a wiring diagram, more or less dimechanism for shiftingslides to and from a pair of spaced magazines on the opposite sides of alens mount [2; the lens mount I2 is provided with the usual lens l3. Themagazines are indi 'cated at l5 and I6 and as shown, each magazinecontains a plurality of slides I8. Each of the magazines is providedwith a follower 28, later to be described. Power means represented inits entirety by 2| is provided for actuating the transport means ll.

Transport means The transport means includes a frame 22 around which theentire device is connected and supported. The frame 22 is substantiallyrectangular in shape and consists of a base or For the sake ofsimplicity, the entire housing or casing 21 of the device will be leftout of the description of the invention, as it plays no part in theinvention except as a covering for the device. The front edges of thebase 23 and top 2 2 terminate in flanges or transport plates 28 and 29,respectively. The flanges are recessed at their edges to form ways 3|and 32 along which the slides'are guided from one position to the other,the upper edge of the slide resting in the recess or way 32, while thelower edge of the slide rests in the recess or way 3!. The slides mayassume three positions: A, aligned with magazine I5; B, aligned with theprojecting position of the projector; and C, aligned with magazine l6. 7

For the purpose of shifting the slides to and fromthe positions A and Cto the position B there is provided a shuttle plate 33. The shuttleplate is substantially square and 'is provided with an opening 34therein of sufiicient size to permit projecting the entire slide area.Guideways 35 and 36 are provided in the rear edges of bottom 23 and top24 of the frame 22, respectively, along which the shuttle plate isshifted from one position to the other. The guideway 35 is formed byrecessing the rear edge of the bottom 23, as shown at 3?, and byrecessing the rear bottom edge of top 24, as

shown at 33. The rear edges of bottom 23 and top 25 have fixed theretohorizontal members 38 and All, respectively, for forming channels withthe recesses ti and 38, respectively, the'lower and upper edges of theshuttle plate 33 slidably engaging recesses or channels 3'! and 38,respectively, and movable therealong to the positions A, B and C.

The shuttle plate 33 is provided with finger members 49 and 5b,represented in an assembled condition as a frame structure 42,.forreleasably engaging the slides for shifting thenrfrcm one position tothe other. The lower and upper parts of each of finger members 49 and 50are pivoted together by pins 43 and 44, respectively, to form asubstantially square frame structure presenting an opening ofsubstantially the same dimension and in alignment with the opening 34 inthe shuttle plate 33. The pin %4 extends through slot 61 in plate 46,the plates 45 and 4G projecting from and being carried by the lower andupper ends, respectively, of shuttle plate 33 (see Fig. 41

The transport means I l includes finger extending and retracting means,slide-displacing means and power means 21 for moving the shuttle to andfrom the positions A, B and C.

Claw-opening and closing means It is important to understand at theoutset that the normal position of the shuttle 33 carry ing the fingermembers and 56 is in the projecting position B and that the shuttle willreturn to the position 3 at the completion of any operation. It is alsoimportant to understand that the fingers are in retracted positionduring their movement away from the position B to either the positions Aor C, and in extended position during their movement from eitherposition A or C to the central position B.

The fingers are biased toward their extended position by a spring 5|,the center of. which is coiled about the pivot point 43 and having oneof its free ends engaging the back of the finger member 40 and at theother free end engaging the back of finger member 50. A similar springmay be provided at the top of the finger memher and coiled about pivotpoint 44. The retraction and extension movements of the fingers arecontrolled by the fore and aft movements of the pins 43 and 44. Each ofthe finger members 48 and 5!! is pivotally supported at its bottom and.

top by pivot pins 52 carried by plates and 46, respectively. It can nowbe understood that by moving pivot points 43 and 44 forward in the slot41, the finger members will turn about their respective pivot points 52to retracted position. and upon moving the pivot points 43 and 44rearwardly, the finger members will turn about their respective pivotpoints 52 to extended position.

It is desired that the extension and retraction of the finger members 40and be automatic and in response to the movement of the shuttle 33. Forthis purpose there is provided an elongated transverse slot 53 in thetop 24 of the frame. Within the slot 53 is positioned an invertedU-shaped member 54 having downwardly extending sides 55 and 56 (Fig.15). The chan- Z1 5 nel is".dividedzrintoi"twoxparallel'tracksr'orguideways; :51: :and 58. 1' The trackwayss arelaseparated bytwo.aligned izeshapedssprings 5.9 andL-B I {The springs; 59: and i 6lrxare oppositely; disposed: and

qpr'ovide'spassage forithe: .ipivot' pin 44' therebetweeng :as'i-best-;sh'ownsin Figs.:.:13i: and "14. The s springsfifl "and T6] :aresupported: at. their centers -rbyT-Iattachingi ,theiiupper portion of;the center of i the invertedU-shaped member- 54. r Anysuitable means maybe employed: forfixingthe center of the springs 59 and 6| totheI-memherl54;.1such asiis' shown: at 641m Figlll5gthemeans .64 being54*so'as not to block thepassageways' Hand 58.

It will be noted that the inner adia'c'entre'nds or'the z shapedspringmember'sffl and' 8| '(Figs. 13. and 14) are curved rearwardly and ineither ts; normalposition at top center of I the projecta ing 1position" B, the rearwardly curved portion of-the cooperating spring59'or Bl 'willguide the pin fl into the forward track 51 and hold" themove separate slidesand at notime is a slide deipendent upon an adjacentslide to'mov'e it from -"one' position to the other. Ascan be'seen inFig.

"10'; the fin ers 66 are employed to movethe slide -"from positio'n" Bto position A; while the fingers 65* are employed"to move the slideiromposition C" to position B.

' Slide-displacing means r In order that a slide may *be movedfrom-theprojection position B into either of the magazines l5 or IE; it isnecessary todisplace the "stack of slides I8 in the magazineinto whichthe slide" is to'enter sufficiently for the entering slideto pass theedge of theinnermost slide in the stack it It. It is also desired thatthe displacfring .means-"beautomatic and in response'to the movement oftheshuttle 33'carryingthe finger -members. Inorder that the stack ofslides l8 samaybepositively tilted'or displaced for the revrceptionofl aslideineithermagazine; two sets woftcam-actuated levers 'areprovided.Oneset is carried'by the-bottom 23 of the frame and the othersetiscarried by the top 24 of the frame. Each of the sets is identical andoperates simultaneouslyifor engaging-the innermost slide in a stackadjacent its lower and upper ends. Since 'each of these sets isidentical and their opera tion simultaneous; only one'setcarried by the'bottompr base 2301? the frame 22 will be "de- *"fscri'bed.

Each-set' consists ofa pair of similar :camoperated levers disposed inopposite relation to each other. and pivoted. on a common pivot 68 xiidisposed" in the plane of the. longitudinal center L their sinner:adjacentsendsx. are spaced .:apart to the -springs 59 ":and .61" to iadjacent: positions of positioned in the-upper portion; of the member.

direction that the pivot pin". 44: :may moveirom fingers in retractedcondition during movement ivy i rotthe:projecting-position B. The-lowersset is a. -mounted..on:the;basegor.-bottom -23&;of.:the;= -frame. :Therlevers. are pivoted intermediate their l'ength =-toi provide a short.leg 169:.and alongerilegll. 5 :Eachfiof the rshor't.-legs -.-69.:terminatesin attorfwardly't'extending "projection, 12 adapted ,toagextend-nthrough an opening l3provided in... the transport plate or-flange- 2 B upon-:the turning: of the. short leg-69 of a lever forward,toward its cm low. operating stackof :slides. l8. Eacheof-theilong-1egs H ,of the levers is' provided adjacent itsffree endwith averticalpin-14 and am membe; 15 :adapted to contact the flange- -28."The; ends of it-he levers carrying the stop member ,liare. biased 15?iforward-rinto. contact with flange 2B.'1."This may deflected-by aspringi'liihavingiits center-coiled xaboutV-the. pivot- 6.81 and its,free ends :engaging' .the 75-; rear edges of 1- the legs! I',thereby"norm'allyiholding... the projections 12-. out of contactwith-the go. i slides in its cooperating gmagazine.

For the purpose cfi-actuating levers to "cause :the 'properprojection-12to displacegitsycorra sponding-slides in .response to movementof {theshuttle 33; there are provided in the lowerand ;;upperfinger membersupporting plates-Hand, respectively; which. are carried by the-5111113718133, -oppositely disposedcam slots Hand 18'; arrangedto-cooperate with pins on'dogs-l l carried-bythe --ends1-of thelong-legs 'H- of the levers. "Uponreferring to Fig. 9-, it will be notedthat theushuttle -33 isinthe position C and that-it is desired to "movethe slide inthe position B into the position A while simultaneously.moving the slide in; the --pos-ition 0 into: the. projecting positionB.In cs order to move this slide in position B into the position A; it isnecessary to displacetheslides 18 -.-in the magazine: {-5 sufiicientlyforethe incoming .-iedgeof'ithesslide from the projecting position B :topass the innermost slidein the magazine. [5.

With the shuttle 33 in'the position C,-.thecam slot TI 1 having engaged.the dog "14- during its move- -mentto the left,=turnsthe cooperating.lever:about Uthe pivot 68 andiextends the pins 'l! in theother mend. ofthe-lever forwardly through anopening 13 the flange 2B and pushestheslides in-magazine ale: forwardly. the shuttle 33 -moves-to gtheq-r-ighu as viewed in Figs. 9u'and lo thetabs or m-fingers 'fifi ofthefinger member 59 will engage the edge of -'the slide in-the position,Bywhil'e the :4 tabs: on fingers will engage the corresponding nside of:the slide in'the position C. *AstheYshuttle wmoves-tothe right,the-slide in the position Bwill enten-rposition A. However, :prior to:the-fslide reachin the pin 12, the cam 'slot 'i'i-will haveireleasedthe pin "54 andthedog-'52 returns to its -.*normal position bythe-spring 16, thereby moving 1 the pin- 1-2 out of the path of-theincoming slide. Conversely, when the shuttle 33 is in-theposition A,the-cam slot T8 will engage the'corresponding dog,.l4 atxpesition A andturn the lever: to-cause .the projectionJZ todisplace the slides intheposiwtion C. or magazine i6" Accordingly the slides n areautomaticallyv displaced in eitherxmagazine l 5 or. IE V for receiving aslide from the" projecting position B in response. to the-movementdofcthe shuttleBS.

5 Power means foroperatmg' the shuttle The power meansfor-operating.the-shuttle 33 791 is hestiflillustratediin FigsZ etc BfinclixsiveQiTheishu'ttle is provided centrallysand zadjacenti-its Mlower edge with aprojectionitl; mpair ofshift levers .8'2- and 33 is provided forshiftin'gzthe shuttlei33. from-the position Brto and from 'thmposi--tions A. andc, respectively. The lever'sr82 and mounting plates 86.

83 are'pivoted at their bottom on stub shafts as shown at 84 and 85,respectively, the shafts being carried by the lower end of a mountingplate 86. The upper end of mounting plate 86 is supported by integralprojections 81 extending downwardly from the bottom 23 of the frame. Theupper ends of the shift levers 82 and 83 terminate in spaced legs 88 and89 for engaging projection 8| on the shuttle 33. The levers are disposedin opposite relation one to the other, the lever 82 being adapted toshift the shuttle 39 to and from the position B to position A, while thelever 83 is utilized to shift the shuttle 33 to and from the position Bto position 0. The legs 89 of the levers 82 and 83 are shorter than thelegs 88 for permitting the projection 8I on the shuttle plate to passover the top thereof, as clearly shown by the drawings. Means areprovided for selectively operating the levers 82 and 83, which consistof crank ears 9I and 92 mounted on the rear end of shafts 89 and 99carried by spaced transverse Each of these crank gears is provided witha crank pin 94 that engages a cam slot 95 in its associated lever sothat when the crank gear 9I is rotated in counterclockwise direction, asviewed in Figs. 3 and 8, the lever 82 will move the shuttle 33 to theposition A and return it to the position B during a single revolution ofthe crank gear 9I and, conversely, the lever'83 will move the shuttle 33from the position B to position C and return to position B during asingle revolution of the crank gear 92, thethe latter operating in aclockwise direction. For the purpose of seleotably rotating the crankgears BI and 92, there is provided a pinion96 carried by the rear end ofa shaft 91. The shaft 97 is mounted in a saddle 98 oscillatably carriedby a shaft 99, the operation of which. will be later described.Normally, the pinion 96 is out of driving engagement with either of thecrank gears 9| or 92. When the saddle 99 is oscillated to the right, asviewed in Figs. to '7 inclusive, the pinion 96 will be brought into meshrelation with idle gear I9I, the latter meshing with the gear 9I. Thepinion 96 is adapted for continuous rotation and means is provided fordisengaging the pinion 96 from the gear I9I at the end of each completerevolution of the gear 9!. Conversely, when the saddle 98 is oscillatedto the left, the pinion 96 will mesh with the gear 92 and rotate thelatter in a clockwise direction, similar means being provided fordisengaging the pinion 96 from the gear 92 at the end of each completerevolution of the gear 92.

The means for oscillating the saddle 98 consists of a pair of magneticcoils I94 and I95 arranged to cooperate with opposite ends of anarmature I96, the latter-being carried by and rigidly fixed to thebottom of the saddle 98, whereby upon energizing the coil I 99, thearmature I96 will cause the saddle 98 carrying the pinion96 to oscillateto the right for meshing with the idle gear I9I. Upon energizing thecoil I95, the armature will cause the saddle 98 to rotate to the leftand mesh the pinion 95 with the gear 92.

The pinion 96 is continuously operated by way of the shaft 91. gear I91,pinion I98, shaft 99, gear I99 and drive pinion III, the latter beingdrivably connected to a suitable motor H2. As above stated, the pinion96 is adapted for continuous operation and is normally out of drivingengagement with the crank gears 9| and 92. Meansis provided for biasingthe pinion toward its .neutral position, which means consists of aspring II3 supported at-its center by bracket II 4 carried by the rearmounting plate 88. Adjacent the ends of the spring H3 and positionedthereabove are rearwardly extending projections H5 and H6 carried by themounting plate 85 for preventing upward movement of the ends of thespring H3. the saddle 98 are provided with rearwardly extendingprojections II! and H8. These projections Hi and H8 extend through slotsH9 and I2I in the mounting plate 86 and overlie the spring H3, thelatter exerting equal tension on the projections and maintaining thesaddle in neutral position.

For the purpose of limiting the crank gears 9I and 92 to a singlerevolution during each energization of the coils I94 and I95,respectively, the pins II! and H8 extend into slots I22 and I23 providedin cam plates I24 and I25, respectively. These cam plates I24 and I25are positioned rearwardly of gears 9I and 92 and are rigidly fixed androtatable therewith. Therefore, as long as the :pins II! and H8 are inengagement with the slots I22 and I23, respectively; the gears 9| and 92are held against rotation. However, upon energizing the coil I94, thearmature carried by the saddle 98 will oscillate to the right and thepin III will depress spring H3 and urge the same downwardly, the pinII'I passing out of the slot I22 in the cam plate I24, and as the camplate I24 rotates simultaneously with the gear 9|, the outer peripheralsurface of the circular cam plate I24 will hold the pin II'l downwardly.Since the pin is carried by the saddle 98, the saddle will be held inits clockwise position and pinion 96 in driving relation with the gear9| until the plate I24 makes a complete revolution and the slot I22comes into alignment with the pin I ll, permitting the spring II 4 tomove the pin upwardly and carrying the saddle 98 to its normal positionand pinion 98' out of engagement with gear 9i. Conversely, uponenergizing the coil I95, the armature will be drawn downwardly and thesaddle 98 turned to the left as viewed in Fig. '7, bringing the pin H9downwardly out of the slot I23 in cam plate I25, the outer surface ofthe cam plate I25 operating to hold the pin H8 downwardly and the saddle98 to the left with the pinion 96 in engagement with the gear 92 until acomplete revolution is effected and the pin H8 is returned into the slotI23, permitting the spring H3 to return saddle 98 to its normal positionand the pinion 96 out of engagement with the gear 92. I

Fig. .18 is a diagrammatic illustration of the wiring diagram whereinthe motor I I2 is adapted for continuous operation by current suppliedby way of conductors I21 and I28, the circuit being controlled by switchI29. The coils I94 and I95 are supplied with current by way of theconductors I99, I3I and I92, the conductor IBI being neutral and the twocircuits selectively controlled by switches I99 and I89. The switchesI93 and I39 are shown in Fig. 1 and may be suitably installed in aconvenient handle I35.

Suitable means is provided for carrying the slides I8 in the magazinesi5 and I9 toward the transport means. The means consists of a follower29 in each of the magazines I5 and I6. The opposite sides of thefollower may be provided with guides 39 extending into grooves I9? formaintaining the followers 29 in aligned position with the slides 29. Theproper tension is supplied to the followers 29 by means of follower armsI99 pivotally connected at their upper end to the followers 29 as shownat I59,

The opposite lower ends-of awaited the lower end; ofaeachlifollower' arm138 being I turnably carried by a stub shaft I4I, the latter after.lithe :slides have been inserted in gthe ma azin -z For the purposeof--providing for slideshaving;differentthicknesses, the cooperatinglower andupperslide ways 3| and 32, respectively, are

of sufiicient width to accommodate the thickest standard slide, andmeansis provided for adjustingthe a ace in the slide ,way 32 at the entranceto either side of the position B tooorrespond with the thickness of theslides being used. Also thewadjustingameans is adaptedqto close theslide. way-= entrance =32 to prevent the en trance of a slide fromeither position A or C tO UtheqpQSitiOn B. -The; adjusting means consistsq-ofav-pivotedt-lever I081 carried by each side ofaflange-115iprojecting radially fromthe rear end of lensmount. TheleversIiiIl are piv-- oted to-flange aI5I adjacent the entrances to theprojecting 'position'B and at the top thereof. The levers I00 are eachprovided with a curved flange I52, presentingtia straight; face I53.Referring .to Figs, 15, lGand -17, Fig..,15 shows the "lever I00 inhorizontal position and p'osik maximum thickness to enterthe positionFig; 17 shows the lever I00 positioned downwardly,1rom:; its;position inFig. 15 and closing the,

passagewayxto prevent the entrance ofa slide torthe position B. Thelatterposition is em DI YedWhemOhan in slid s inthe ma azin s or,

in --movi ng:;thev device from one: place to the Otheri 4 For. thepurpose I, of maintaining the slide in; proper aligned. position, in the:position B, there is providedaa spring-heldframe member I 54,('seeFigs.;,9 to-12',;inclusive) The sidestof frametltt terminate:infforwardly extendingflanges I55 for guiding the slide to the rear ofthe frame I54 and along the slide passageway.

The upper and lower members of the frame member I54 are each provided attheir centers with a forwardly extending pin I56. These pinsextendthrough openings I51 provided in cross members I58 carried by theflange I5I. Springs I59 are'interposed between the cross members I58 andthe corresponding lower and upper members of the frame I54. The springI59 operates to urge the frame I54 rearwardly and against the slide or,in the absence of a slide, being in the position B, the frame will restagainst the lower and upper slide transport plates 23 and 29. The frameI54 presents an opening comparable to the opening 34 in the shuttleplate 33.

The operation of the device is as follows: Upon energizing the coil I04,saddle 98 is turned to the left by the armature I05, meshing the pinion96 with the gear IIII, the latter being in mesh relation with the crankgear 9 I. The crank shuttle 33ris carriedfrom' the-rposition 'Bttorthd 1position "A andreturned ltoiathe positioneBbye meansof the shiftlever82:? This procedureimaytv be repeated "or the coil; H15 maylbe..energizedhbye closing the switch 1134; .twhich= will cause i-the...saddle'ffiil r to be turned to'uthe Lleft Zbyf meansof e the armaturellllibringing lithe pinion slir i'ntora mesh relation with the crankgear: 92 land turn-w ing the same a complete revolution duringtwih-ichtime the shift'arm- 83rrcarriesithe shuttl'e1'33i from'ks the position Bto the'position c andireturnedato 1: position B." During thevmovement'ofthe .shu'ttle "33: from the position B tor the position A, .1the" camnslot; 18 will engage" the pin 14 in the-:-leg.:;1I1of the-"rcooperating lever, and the lever ,;will'; bekturnedc'f to urge. the"pinrlz I carried: by its, ishortaendvfillnz'zr forward through, theopening H'imthe platez28y: and: push the S1id8518 inthesmagazinefllfifore ward so that upon the return of theshuttle.-'33i::' from the position A vto the position 13,; theltabs orfingers 65' ofthe fingerl'member i,,wil=lil'1r'ge-.;: r the slidein' theposition B into.the poSitiohrQz'i. It will be noted that as-the shuttle;plate 311103785" the pin 14, and the spring 16 will operatertor; turnthe lever; and withdraw!theipinlrn from the recess T3: in the; plate28:: prior to; l'lhEjnSlidG-(Jii reaching nthe v position, ofrthey:pin:,t12, ilwhereby. the slide is permitted to ipass along-theslijdeiway and into its'ipositionin themagazineelfii 5:1;A1SQ31}; duringthe movement 10f the shuttlje:;33. *from i position B .to position A,the, :pin :44 ;:car,r.i..eck bysfl the finger members is -directed.by:.1the: spring-1 into the forward-track; 511 in itheix'invertedibgushaped: member 3' 54,: thereby a: holding the -=1 ingers'::; inretractedwjcondition '-during;- the1mql e entrzo st A. When thepin;44rreachesc-th'exoutertend .o 1;? the spring 6| andrpassesthe-iforwardlyjturnedryf end thereof,.the pin: 44r willa be: directed;into the rear passageway58 in the member 54 and thereby: 1 extend thefingers y during the; movement of p-th shuttle i from the wposition: :A;.,to%. position;t B. It will I also; .be IlQtfid-i that: dur 41 1movemen 1:; ofthe shuttle :from the :positionrrA toizpositio B, thefingers-7'6 5" of the-finger 1 memberdflz will operate to urgesthe'jslide :jinrtherpositidnnfi 3150" the position 0 while the-ufingersxfifitOn: the. fin e member: 50 will engage: the slide in @the' position, Aand moveit Ito positiontB. The' slidesjare ate; alltimesapositivelymoved by the fingermembers; and at :.no' time :is :a slidedependenta'zupion s :an other slide for moving "it from "one-positionetc 2; the other. The operation of the device for moving the slides fromthe position C' to the position B is identical except for the directionas that described in the connection with the movement of the slide fromthe position A to the position B.

While there has been illustrated and described one form of the presentslide changing device, it will be obvious to those skilled in the artthat certain changes, modifications, substitutions, additions andomissions may be made in the structure herein disclosed withoutdeparting from the spirit and scope of the appended claims I claim:

1. A slide-exhibiting apparatus comprising, in combination: a pair ofspaced magazines each adapted to carry slides in stacked condition; atrack member disposed transversely to said magazines and interconnectingone end of each for guidance of slides therebetween to and from an gear9| is rotated a single revolution and the 15 intermediateslide-exhibiting position; means 11 urging the stacked slidesagainstsaid track member, whereby the slides confronting. said magazinestend to obstruct transport of slides thereto; a shuttle for transportingslides along said track member, said shuttle having a pair of fingermembers which are spaced apart by substantially a slide width, saidfinger members adapted to engage and to disengage slide members upon 7extension and retraction, respectively, of said finger members; meansautomatically operating by movement of said shuttle to extend saidfinger members when they arrive at and confront either of saidmagazines, and to retract them when they arrive at and confront saidslide-exhibiting position; and means for selectively displacing amagazine-confronting slide into its corresponding magazine in responseto a shuttle movement intended to transport an exhibited slide to aposition'confronting the said corresponding maga- 2. A slide-exhibitingapparatus as in claim 1 and including in combination therewith means formoving the shuttle through a slide-changing cycle which both begins andends with the pair of finger members confronting said slide-exhibitingposition.

3. A slide-exhibiting apparatus as in claim 1 and including incombination therewith shuttlereciprocating means adapted to becontrolled to selectively transport a slide confronting either magazineto said slide-exhibiting position.

4. A slide-exhibiting apparatus as in claim 1 and including incombination therewith controllable motor means for moving the shuttlethrough a slide-changing cycle in which the shuttle is moved from aposition in which said pair of finger members confronts saidslide-exhibiting position, selectively to a position in which saidfinger members confront either said magazine, thence again to saidslide-exhibiting position.

' 5. A slide-exhibiting apparatus comprising, in combination: a pair ofspaced magazines, each adapted to carry slides in stacked condition; atrack member interconnecting one end of each said magazine for guidanceof slides therebetween to and from an intermediate slide-exhibitingposition; a shuttle adapted to transport slides along said track member,said shuttle having a pair of slide-engaging finger members spaced apartby substantially a slide width; and means for cans ing said shuttle toselectively execute a slide changing cycle wherein said pair of fingersis moved, from an initial position confronting said slide-exhibitingposition, selectively to a position levers each selectively engageablewith said shut- V tle, and means for selectively moving each said leverthrough a single, repeatable, complete cycle which includes transport ofa slide from a selected magazine to said slide-exhibiting position. 7. Aslide-exhibiting apparatus comprising, in combination: a pair of spacedmagazines each adapted to carry slides; 'a track member interconnectingone end of each said magazine for guidance of slides therebetween to andfrom an intermediate slide-exhibiting position; a shuttle adapted totransport slides along said track mem-- ber, said shuttle having a pairof finger members which are spaced apart by substantially a slidewidth,said finger members adapted to engage and disengageslide members uponextension and retraction, respectively, of said finger members; andmeans automatically operating by movement of said shuttle to extend saidfinger members when they arrive at and confront either of saidmagazines, and to retract them when they arrive at and confront saidslide-exhibiting position.

RICHARD A. HARTLEY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,073,331 Colardeau Sept. 16,1913 1,349,640 Trueblood Aug. 17, 1920 1,437,112 Lep-ine Nov. 28, 19221,691,414 Thornton Nov. 13,1928 1,729,304 Wagner Sept. 24, 19291,752,952 Jelenik Apr. 1, 1930 1,839,545 Frye Jan. 5, 1932 1,850,903Tryon et a1 Mar. 22, 1932 1,982,739 Kaden et a1. Dec. 4, 1934 2,069,595Thomas Feb. 2, 1937 2,255,719 Warriner Sept. 9, 1941 2,260,660 DarwinOct. 28, 1941 2,310,047 Waldeyer Feb. 2, 1943

